Manufacture of creped paper



Sept. 26, 1933. E H ANGER 1,928,045

MANUFACTURE OF CREPED PAPER Filed Oct. 10, 1932 Patented se -2s, 1933 n 1,928,945 F CREPE!) Edward H. Angler, Framingham, Mass a-ignor toltdwardli. trustee Angien l 'ramingham, Mala, as

Application-October 10', res z Serial No. 031,008

0 Claims. (01.. 154-33) The obiect of this invention is to provide an advantageous process for producing creped paper having asphalt or similar water-resisting material associated therewith. a 5 The invention will be well understood by reference to the following demription taken in connection with the accompanying drawing in which I have shown a diagram of the process.

For many years paper 0! the krait type has been creped by the roll and doctor creping process, essentially as described in the patent to Arkell 790,021, granted May 16, 1905. The process involved wetting the never to bring it to a semi-pulpy condition, pressing the damp web into adherence with the creping roll and crowding it back on itself while adherent thereto.

When water-resistant paper was required, two

sheets had been duplexed together by means of an intervening layer 01 asphalt applied in melted form and the duplex layer was then treated as above described and creped as a unit. In my I Patent 1,003,932, dated Oct. 19, 1926, I have described combining together two webs of paper by means of an asphalt emulsion applied cold, that is; at room temperature, which were then creped before the asphalt had entirely set or precipitated from the emulsion. Qne advantage of this process was that it couldbepractised at room temperature without heat, whether 30 to melt the asphalt or to soften the? paper.

I have discovered that I may prepare a creped paper having asphalt distributed throughout the surface thereof by utilizing asphalt emulsion both to coat the paper on one side and to secure its adhesion to the creping roll.

diagrammatic showing in the drawing. A sheet of paper is drawn from the mill roll 3. Asphalt emulsified by being beaten up in water with a suitable emulsifying agent such as bentonite. to provide a fluid suspension of solid particles in water is flowed onto one surface of the paper, as here indicated by the diagrammatic showing of the tank 5. Convenientlythe emulsion as here applied'may be quite fluid. The web of paper may then pass under a suitablescraper'l by means of which'the suspension is distributed evenly over the face of the paper web. The paper blots up to a certain extent some of the water from the emulsion which thus tends to coagulate and become viscid. Coagulation may further be promoted by permitting the web to,

travel as desired, for instance, on the carrier belt 9,whichmaybesimilartothewireofarourdrinier paper making machine. I have herein The process will be well understood from the shown the belt as over a suction box 11, the character 01' which is diagrammatically illustrated by the showing of the exhaust pump 13. Suction will thus tend to draw the water out from the emulsion and into the body of the paper, aiding in preparing it for the creping operation.

When the web of paper arrives adjacent the creping roll 15 the asphalt in the suspension has been partly precipitated and the material on the 5 paper is more or less viscid or tacky. The coated face is led directly into contact with the roll 15 and a squeeze roll 1'? may, if desired, be provided to assure its uniform adhesion thereto. The paper is advanced to the doctor blade 19 and is crowded back on itself in the customary manner while held against the surface of theroll by the adhesiveness oi the now partly coagulated and more or less viscid emulsion. It will be noted that the asphalt is not completely passed into the solid phase from the original fluid emulsion and it will not adhere to the smooth-metal creping roll 15 in preference to the web of paper with which it is already-more or less united. The extent of the coagulation or set is properly regso ulated so that it will not stick or gum up the machinery. Since the process is continuous, paper coated with the semi-fluid material constantly arrives on the creping roll so that conditiona there are constant and readily regulated to provide the proper degree of adhesion. It may be pointed out that the operations referred to may be carried out in the cold, that is, atroom temperature The material may be led away from the roll to be of in any desired manner,

for instance, to dry further to permit complete coagulation or precipitation or the asphalt. I have herein shown itas led between the squeeze rolls 20 and a web of burlap 21 also passed to the rolls to be applied to the coated face oi the paper to adhere thereto since. the asphalt has not completely set and thus has not lost its adhesive properties. This particular arrangement. provides a compound product consisting of creped paper secured to burlap by means of asphalt which forms a water-resistingnlm throughout a surface of the The asphalt commonly used commercially in 5 the preparation of waterproof paper is the pitchy reddue of petroleum distillation known by that name. By solid material"- in' the following claims I refer thereto and to similar pitches and gums which are normally solid-at room tempera- 1 2 tures and which in coagulating from a suspension pass through a more or less viscid phase.

I am aware that the invention may be embodied in other specific forms without departing creped paper by roll and'doctor which comprises coating the paper witha suspension of finely divided, normally solid, water-resisting material,

depositing the same on a creping roll with said coating in immediate contact with the face of the roll and crowding the paper back on itself while adherent to the roll.

2. A method of producing water-resistant creped paper which comprises spreading on the paper a suspension in a watery vehicle of finely divided, normally solid material, effecting partial precipitation of the suspended material, depositing the paper on a creping roll with said coating in immediate contact with the face of the roll and crowdingthe paper back on itself while adherent to the roll.

3. A method of producing water-resistant creped paper which comprises spreading on the paper a suspension in a watery vehicle of finely divided, normally solid material, effecting partial precipitation of the suspended material by withdrawal of the vehicle into the body of the paper.

4. A method of producing creped paper having a film'of solid material extending thereover which comprises preparing a fluid suspension of such material in a suitable liquid vehicle, flowing-such suspension over a surface of the paper,

, developing viscidity in the coating by elimination of a part of the vehicle, causing the paper to adhere to a creping roll by adhesion of such viscous coating and crowdingvthe paper back on itself while so adherent. I

5. The method of producing creped paper having a film of solid material thereover characterized by the facts thatthe material is permitted to coagulate on the paper from a suspension thereof and that creping is effected by utilizing the adhesiveness of the partly coagulated material to tack it to the creping roll for operation of the doctor thereon.

6. The method of producing creped paper having a film of solid material thereover. character- 

